title: (3S,3aS,6R,6aR)-2-Oxohexa-hydro-furo[3,2-b]furan-3,6-diyl dibenzoate.
abstract: The title compound, C20H16O7, contains a cis-fused γ-lactone tetra-hydro-furan ring system functionalized with two benzo-yloxy groups. Both rings adopt an envelope conformation. The mol-ecule assumes an elongated shape and exibits non-crystallographic C 2 symmetry. The benzo-yloxy groups are almost planar [maximum deviations of 0.0491 (15) and 0.0336 (17) Å for the O atoms] and their mean planes are inclined to one another by 16.51 (4)°. The crystal packing features weak C-H⋯O inter-actions. The aryl groups of adjacent mol-ecules are parallel shifted with face-to-face contacts and a shortest inter-molecular C⋯C distance of 3.482 (4) Å.
authors.affiliation: Dipartimento di Scienze Chimiche, Università degli Studi di Napoli 'Federico II', Complesso di Monte S. Angelo, Via Cinthia, 80126 Napoli, Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Piccialli
authors.forename: Giorgia
authors.initials: G
authors.lastname: Oliviero
authors.forename: Sabrina
authors.initials: S
authors.lastname: Zaccaria
authors.forename: Roberto
authors.initials: R
authors.lastname: Centore
authors.forename: Angela
authors.initials: A
authors.lastname: Tuzi